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传统的定转向传动比机构显然无法满足上述要求,但宝马的主动转向系统通过叠加转向机构完全能够实现。该系统传动比在10～20之间,低速情况下,通过双行星齿轮机构伺服电机的调整角和转向盘转角同向输入,使得系统的传动比较小,实际上是增大了驾驶员的转向角输入,从而获得较大的期望横摆角速度增益并使得转向轻便;在中、高速情况下,伺服电机的调整角和转向盘转角反向输
The traditional fixed-steering ratio mechanism obviously can not meet the above requirements, but BMW’s active steering system is fully realized by the superposition of the steering mechanism. The transmission ratio of the system is between 10 and 20, and at low speed, the input angle of the servo motor of the double planetary gear mechanism and the steering wheel angle are input in the same direction, so that the transmission ratio of the system is relatively small, which in fact increases the driver’s steering Angle input, so as to obtain a larger desired yaw rate gain and make the steering light; in the high-speed case, the servo motor adjustment angle and the steering wheel angle reverse input